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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 24 Feb 2017
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      So many people are getting the SHA1 story wrong. With the collision that Google released, *anyone* can create colliding PDFs for *free*.

      13 replies 353 retweets 396 likes
    2. Hector Martin‏ @marcan42 24 Feb 2017
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      Replying to @marcan42

      You can take the two sets of 320 bytes that were published, append *anything* to both sets, and they will still have the same hash.

      6 replies 105 retweets 105 likes
    3. Andrew Gallagher‏ @andrewgdotcom 25 Feb 2017
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      Replying to @marcan42

      @thegrugq yes, but it has to be the same anything to both files. Which makes it more useful for vandalism than for fraud.

      1 reply 0 retweets 0 likes
    4. Hector Martin‏ @marcan42 25 Feb 2017
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      Replying to @andrewgdotcom @thegrugq

      You could have one document digitally signed, then swap it with another one.

      1 reply 0 retweets 0 likes
    5. Andrew Gallagher‏ @andrewgdotcom 25 Feb 2017
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      Replying to @marcan42 @thegrugq

      but what would the differences be? Would they be *useful*?

      1 reply 0 retweets 0 likes
    6. Hector Martin‏ @marcan42 25 Feb 2017
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      Replying to @andrewgdotcom @thegrugq

      You can make the two documents look completely different. See https://alf.nu/SHA1  and my other tweets.

      1 reply 1 retweet 0 likes
    7. Andrew Gallagher‏ @andrewgdotcom 26 Feb 2017
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      Replying to @marcan42 @thegrugq

      aha, sorry I get it now. You add the same data to both files but in one case the first half of it is commented out.

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 26 Feb 2017
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      Replying to @andrewgdotcom @thegrugq

      Effectively, yes. This also works for executable files and many complex file formats.

      4:24 AM - 26 Feb 2017
      0 replies 0 retweets 0 likes

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